Re: Parsing nested statements: was Re: gnubol: subsets

[Tim Josling <TIMJOSLING@prodigy.net>]

It's not a show stopper just more to do. A bit like next-sentence / end-if
handling.

How would you parse these (if not how the indentation suggests)?

add a to b // just an abvious starting point
    size error
          add c to d
          display ...
.

add a to b
   size error
         add c to d
            size error // it can only bind in one place I guess
                   add e to f
.

add a to b
   size error
      add c to d
   not size error // this is what the standard says though it is not right
associative
      add e to f
.

add a to b
   size error
          add c to d
                 size error
                      add e to f
                 not size error // we are in uncharted waters here - what does
IBM do?
                       add g to h
.

Tim Josling

Michael McKernan wrote:

>   Tim> I have no problems if Bob is right, but if the IBM
>   Tim> compilers behave as suggested I have a lot more work to do.
>
>   Tim> Tim Josling
>
> ...
> Since this is not a specification like the standard, but a
> description of an implementation, it obvously should be verified.  I
> don't see the work to be done as especially onerous, however.  You
> stop scanning ahead, remove the extra productions and stop trying to
> distinguish between imperative and conditional statements.  Now
> everything falls out.  Are there other problems?
> ...Mike


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